Buy a Dual core Amd x2 I promise you will not be sorry
http://www.overclockers.co.uk/acatalog/AMD_64_X2.html £246
http://www.overclockers.co.uk/acatal...ocket_939.html mobo £70
http://www.overclockers.co.uk/acatalog/Corsair_XMS.html buy a dual channel kit as you get extra bandwidth £90 for 2x512 - £200 for a dual kit 2x1gig
£520 without case so this leaves enough in budget and it gives you 2 gig of ram